The current deadline is December 1.
"We are not ready. We have told the UIDAI and the Telecom Department that timeframe which has been given to the operators from UIDAI is unrealistic in terms of implementation that is being proposed," Director-General of Cellular Operators' Association of India Rajan Mathews told PTI.
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Besides, it has flagged that Customer Acquisition Form (CAF) will need suitable modification under the new system, and operators will require at least 4-6 weeks after a key issues have been decided.
"Considering the technical changes that the telecom operators have to undergo, the timelines for implementation of any such process should be realistic, at least 4-6 weeks from the date of the process being finalised and implementation orders issued by Department of Telecom (alongwith the new eCAF)," Mathews said in a letter dated November 20 to the UIDAI.
COAI, which represents telecom majors like Bharti Airtel, Vodafone, and Idea Cellular, said that the present customer acquisition form will need to be modified as "it would not be possible for the telecom service providers to fill many of the mandatory fields in the CAF in an OTP-based process".
It said that modified CAF is required to be issued by the DoT and "the same would need to be developed by the telecom service providers and incorporated in their apps pan India".
The government announced last month that it would simplify the Aadhaar-based verification of existing SIMs by enabling OTP-based authentication.
Telecom service providers have been instructed to initiate a scheme to use OTP based re-verification of mobile subscribers using IVRS or mobile app.
While the authentication of mobile phone number with Aadhaar, a process called re-verification, by visiting stores of telecom firms will continue, the government has also ordered the companies to carry out the exercise at the doorsteps of the disabled, chronically ill and senior citizens.